# Lucerne Valley

- **MSHA mine ID:** 0405690
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** San Bernardino, CA
- **Operator:** Robertson's
- **Controller:** RRM Development Corporation; Mitsubishi Corp
- **Public source rows linked:** 481
- **Source coverage:** 13 / 20
- **Generated:** 2026-10-13T11:26:59.401Z

## Current entity hierarchy

**RRM Development Corporation; Mitsubishi Corp (M11611) → Robertson's (L14361) → Lucerne Valley (0405690)**

Current identity source: `msha-mines`. This is a current snapshot, not a historical claim.

## Controller and operator valid-time history

- **RRM Development Corporation et al → Robertson's:** 2006-07-17 through current/open; derived from co-tenure at mine 0405690; source `msha-controller-operator-history`.
- **Mitsubishi Corp  et al → Robertson's:** 2006-07-17 through current/open; derived from co-tenure at mine 0405690; source `msha-controller-operator-history`.

- History rows: 2
- Typed edges: 4
- Interval anomalies: 0
- Valid-time bounds: inclusive; date granularity; null end means open-ended in the upstream history row; not independent proof of present control.
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00.

## Assessment signals

1. **SAFETY — 1 since 2021:** Accidents and injuries 6 historical accident/injury rows; 0 coded fatalities and 54 lost days across the published record.
2. **COMPLIANCE — 3 since 2021:** Violations and penalties 102 violation rows across the full record; 21 carry an S&S flag and $40,800 appears in current assessed amounts.
3. **HEALTH — 14 samples:** Occupational health samples 14 personal. 0 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.
4. **PRODUCTION — 0 tons:** Quarterly production and employment 6K employee hours and 10 summed average employees across reported subunits in the latest published quarter.
5. **LEGAL — 13 linked rows:** Contests, conferences and decisions 4 contested-violation rows, 4 civil-penalty docket/decision rows, and 5 conference records linked by issuance number.
6. **CONTRACTORS — 0 linked entities:** Contractors Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.
7. **INSPECTIONS — 13 since 2021:** Inspections 55 inspection events and 909 published inspection hours across the historical record.

## EIA annual operating context

No matched record in the 2024 EIA coal-public workbook. This may be inapplicable for a non-coal operation.

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 56.12002 — Controls and switches.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12002
- **30 CFR 56.20003 — Housekeeping.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003
- **30 CFR 56.12032 — Inspection and cover plates.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12032
- **30 CFR 56.16005 — Securing gas cylinders.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-O/section-56.16005
- **30 CFR 56.14110 — Flying or falling materials.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14110
- **30 CFR 56.14112 — Construction and maintenance of guards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.12004 — Electrical conductors.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 56.11002 — Handrails and toeboards.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11002
- **30 CFR 47.41 — Requirement for container labels.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.41

## Source coverage

- **Accident, Injuries, and Illnesses:** 6 rows; 2006-08-19 through 2023-02-16; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2010-10-01 through 2010-10-01; source ID `msha-addresses`
- **Assessed Violations:** 102 rows; 2006-08-29 through 2025-06-18; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 4 rows; 2010-06-23 through 2011-06-15; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 5 rows; 2008-12-23 through 2015-09-21; source ID `msha-conferences`
- **Contested Violations:** 4 rows; 2009-04-21 through 2009-10-14; source ID `msha-contested-violations`
- **Controller and Operator History:** 2 rows; 2006-07-17 through 2006-07-17; source ID `msha-controller-operator-history`
- **Inspections:** 55 rows; 2006-08-29 through 2026-07-09; source ID `msha-inspections`
- **Mine Employment and Production — Quarterly:** 160 rows; unknown through unknown; source ID `msha-mine-production-quarterly`
- **Mine Employment and Production — Yearly:** 25 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Metal and Nonmetal Personal Health Samples:** 14 rows; 2007-06-13 through 2025-06-18; source ID `msha-personal-health-samples`
- **Violations:** 102 rows; 2006-08-29 through 2025-06-18; source ID `msha-violations`

## Caveats

- This is public-record decision support, not legal advice or an official MSHA record.
- Missing data can indicate no event, publication delay, an unresolved identity, or inapplicability.
- Contractor production data is entity-level and is not attributed to this mine.

## Alternate representations

- HTML: `/mines/lucerne-valley-0405690`
- JSON: `/api/v1/mines/lucerne-valley-0405690`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/0405690/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/0405690/relationships`
- MCP resource: `mine://0405690/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`